1. Going eastward, you’ll pass mountains and thousands of lakes and forests, as well as wide rivers and large cities. (P34)
Going eastward是现在分词短语作时间状语，相当于一个状语从句When you go eastward，分词短语可以在句中作时间、原因、方式或结果状语。分词作状语时其逻辑主语必须和句子的主语一致。如果分词与句子的主语构成逻辑上的主谓关系，那么用现在分词；如果分词与句子的主语构成逻辑上的动宾关系，那么用过去分词。如：
They stood there waiting for the bus.
Asked to work overtime that evening, I missed a wonderful film.
【练习】 用所给动词的适当形式填空：
1） ______ (hear) the knock on the door, they stopped talking. （听见有人敲们，他们停止了谈话。）
2） ______ (see) from the top of the hill, the city looks more beautiful to us. （从山顶看城市，城市显得更漂亮。）
